Automatic limit adjustment circuit

Abstract

The present invention discloses an automatic amplitude limiting adjustment circuit, comprising: a boost circuit and an amplitude limiting circuit, wherein the boost circuit and the amplitude limiting circuit are connected in parallel between a voltage input terminal and an output terminal. The boost circuit comprises a multi-stage boost module connected in series, wherein the multi-stage boost module converts a multi-stage AC voltage into a DC voltage and performs a superimposed voltage boost. Each stage of the amplitude limiting circuit comprises a MOS transistor, wherein the MOS transistor has a threshold voltage VTH for conduction. When the voltage between the gate and source of the MOS transistor is higher than the threshold voltage VTH, the MOS transistor is turned on and stabilized near the VTH voltage. Conversely, the MOS transistor is turned off, thereby ensuring that the chip output voltage meets the system power supply requirements. The system's requirements for limiting the output voltage amplitude are met by selecting the type and size of the MOS transistor.

Description

Technical Field

[0001] The present invention relates to the field of power supply management and microelectronics technology, in particular to an automatic amplitude limiting adjustment circuit. Background Art

[0002] Chips often need to limit the power supply amplitude and reduce chip power consumption. Therefore, a low-power voltage limiter needs to be integrated inside the chip to ensure that the voltage is within the appropriate range.

[0003] In energy harvesting applications, the input signal often fluctuates widely. For example, in energy harvesting applications, the collected energy is converted into an electrical signal and input into a regulation circuit. This results in large voltage fluctuations in the regulation circuit's output. In some precision circuits, this voltage may exceed the load operating voltage range or the circuit's own operating voltage range, which is unacceptable. Therefore, a voltage amplitude limiter is required to limit the output voltage to a certain range.

[0004] When limiting the output voltage, the limiting circuit itself consumes power, which can be wasteful for some micro-power applications. This is unacceptable for micro-power applications, especially for energy harvesting applications, where the power consumption must be as low as possible. Summary of the Invention

[0005] The present invention provides an automatic amplitude limiting adjustment circuit, which can ensure that the chip output voltage meets the system power supply requirement.

[0006] To achieve the above object, the present invention provides an automatic amplitude limiting adjustment circuit, comprising: a boost circuit and an amplitude limiting circuit, wherein the boost circuit and the amplitude limiting circuit are connected in parallel between a voltage input terminal and an output terminal.

[0007] The boost circuit includes a multi-stage boost module connected in series, and the multi-stage boost module converts a multi-stage AC voltage into a DC voltage and performs superimposed boosting.

[0008] The limiting circuit includes a plurality of limiting circuits corresponding to the multi-stage boost modules, and each stage of the limiting circuit is connected in parallel with the boost module of the corresponding stage.

[0009] Each level of the limiting circuit includes a MOS transistor, which has a threshold voltage VTH when it is turned on. When the voltage between the gate and source of the MOS transistor is higher than the threshold voltage VTH, the MOS transistor is turned on and stabilized near the VTH voltage. Otherwise, the MOS transistor is turned off.

[0010] Compared to the prior art, the present invention proposes an automatic amplitude limiting adjustment circuit, comprising: a boost circuit and an amplitude limiting circuit, wherein the boost circuit and the amplitude limiting circuit are connected in parallel between the voltage input and output terminals. The boost circuit includes a multi-stage boost module connected in series, which converts multiple AC voltages into DC voltages and performs a superimposed voltage boost. Each amplitude limiting circuit includes a MOS transistor, which has a threshold voltage VTH for conduction. When the voltage between the gate and source of the MOS transistor is higher than the threshold voltage VTH, the MOS transistor is turned on and stabilizes near the VTH voltage. Otherwise, the MOS transistor is turned off, ensuring that the chip output voltage meets the system power supply requirements. The system's requirements for output voltage amplitude limitation are met by selecting the type and size of the MOS transistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a circuit principle diagram of the automatic amplitude limiting adjustment circuit of the present invention.

[0012] Figure 2 It is a schematic diagram of the principle of the MOS amplitude limiting adjustment circuit of the automatic amplitude limiting adjustment circuit of the present invention.

[0013] Figure 3 It is a schematic diagram of the automatic amplitude limiting and dynamic response process of the present invention.

[0014] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0015] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0016] Please refer to Figure 1 、 Figure 2 and Figure 3 As shown, Figure 1 This is a schematic diagram of the principle of the low-power, wide-dynamic automatic amplitude limiting adjustment circuit of the present invention. Figure 2 It is a schematic diagram of the principle of the MOS amplitude limiting adjustment circuit of the automatic amplitude limiting adjustment circuit of the present invention. Figure 3 It is a schematic diagram of the automatic amplitude limiting and dynamic response process of the present invention.

[0017] The present invention provides an automatic amplitude limiting adjustment circuit, which relates to the fields of energy collection, power management and microelectronics, such as radio frequency energy collection, solar energy collection and the like.

[0018] The automatic amplitude limiting adjustment circuit proposed by the present invention comprises a voltage boosting circuit and an amplitude limiting circuit, wherein the voltage boosting circuit and the amplitude limiting circuit are connected in parallel between a voltage input terminal and an output terminal.

[0019] The boost circuit includes a multi-stage boost module connected in series, which converts the multi-stage AC voltage into a DC voltage and performs superposition boosting. Figure 1 As shown, the multi-stage boost module includes upgrade modules 1-4, upgrade modules 5-8, and upgrade modules 9-12.

[0020] The limiting circuit includes multiple levels of limiting circuits corresponding to the multiple levels of boost modules, and each level of limiting circuit is connected in parallel with the corresponding level of boost module. Figure 1 As shown, the multi-stage limiting circuit includes three stages of limiting circuits, namely, limiting circuit 1, limiting circuit 2, and limiting circuit 3.

[0021] Each level of the limiting circuit includes a MOS transistor, and the MOS transistor has a threshold voltage VTH when it is turned on. When the voltage between the gate and source of the MOS transistor is higher than the threshold voltage VTH, the MOS transistor is turned on and stabilized near the VTH voltage. Otherwise, the MOS transistor is cut off. The principle of the MOS adjustment limiting circuit of the automatic limiting adjustment circuit is as follows: Figure 2 As shown. The MOS tube consumes very little current when it is cut off, and the power consumption is negligible. The working process is as follows Figure 3 shown.

[0022] Among them, the standard CMOS integrated circuit manufacturing process provides a variety of MOS tube options, and the appropriate type and size can be selected to meet the system's requirements for output voltage amplitude restrictions.

[0023] The present invention takes into account that in the prior art, it is often necessary to limit the power supply amplitude and reduce the power consumption of the chip. Therefore, it is necessary to integrate a low-power voltage limiter inside the chip to ensure that the voltage is within an appropriate range. In energy harvesting situations, the input signal is often a signal with a large fluctuation range. For example, in energy harvesting applications, the collected energy is converted into an electrical signal and input into the adjustment circuit. At this time, the output voltage of the adjustment circuit fluctuates greatly. In some precision circuits, it may exceed the load operating voltage range or the operating voltage range of the circuit itself, which is not allowed. Therefore, it is necessary to design a voltage amplitude limiter to limit the output voltage to a certain amplitude.

[0024] When limiting the output voltage, the limiting circuit itself consumes power, which can be wasteful for some micro-power applications. This is particularly true for energy harvesting applications, where the power consumption requirement is as low as possible.

[0025] While ensuring low power consumption and a wide input dynamic range, requirements are placed on the voltage regulator's operating range. For example, a certain RF energy harvesting chip requires an input power range of -20dBm to 0dBm. After internally boosting the voltage by a factor of 10, the maximum output voltage is 3.3V. However, the maximum load operating voltage of the energy harvester is 1.95V, exceeding the safe operating voltage. Therefore, the output voltage amplitude must be limited to 1.95V. This ensures that the chip's output voltage meets the system power supply requirements.

[0026] The present invention proposes an automatic amplitude limiting adjustment circuit, comprising: a boost circuit and an amplitude limiting circuit, wherein the boost circuit and the amplitude limiting circuit are connected in parallel between a voltage input terminal and an output terminal. The boost circuit includes a multi-stage boost module connected in series, which converts multiple AC voltages into DC voltages and performs a superimposed voltage boost. Each amplitude limiting circuit includes a MOS transistor, which has a threshold voltage VTH for conduction. When the voltage between the gate and source of the MOS transistor is higher than the threshold voltage VTH, the MOS transistor is turned on and stabilizes near the VTH voltage. Otherwise, the MOS transistor is turned off, ensuring that the chip output voltage meets the system power supply requirements. The system's requirements for limiting the output voltage amplitude are met by selecting the type and size of the MOS transistor.

[0027] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An automatic amplitude limiting adjustment circuit, characterized in that: include: A boost circuit and a limiter circuit are connected in parallel between a voltage input terminal and an output terminal; the boost circuit comprises a multi-stage boost module connected in series; the limiter circuit comprises a multi-stage limiter circuit corresponding to the multi-stage boost module, each stage of the limiter circuit being connected in parallel with the boost module of the corresponding stage; each stage of the limiter circuit comprises a MOS transistor, the MOS transistor having a threshold voltage VTH for conduction. When the voltage between the gate and source of the MOS transistor is higher than the threshold voltage VTH, the MOS transistor is turned on and stabilized near the VTH voltage; otherwise, the MOS transistor is turned off.

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